Is 24,000 btu enough to adequately cool a non-converted/no real rool insulation MCI9 under normal circumstances? I do not suppose I will be in 100 plus temperatures frequently, just looking for some general ideas of need.

Generally, under 90 degrees, it should be good. I have three 13,000btu roof tops and with lightly tinted windows and with 2.25" of blown in insulation, I can run just two in up to 100 degree weather. Higher, I run all three. Good Luck, TomC

MC8, steel roof tent, stock ceiling, all original two pane windows, two old mid 1980's roof airs, sitting in an open field of a KOA, in the sun, 98 degrees outside, it stayed cool inside.(Behind Bronner's Christmas store in Frankenmouth MI, what a place!)

Now, whether there was enough capacity to pull down an already hot coach, I doubt it.

How much air you want depends on how often you might be returning to the coach after it has been parked out in the sun all day and the entire interior has reached triple digit temps.

Lots of BTU does the job quicker, at a higher price intially and ongoing in higher cycling/less efficient operation once comfortable conditions have been reached in the interior.

I live north, and have "too much" heating BTU. Some live south, and have "too much" cooling BTU.

Best thing about building your own coach: you decide what you want, not some manufacturer's accountant and a bunch of new product focus groups!

I have a two stage basement unit from RV products/coleman (2 ton). It has a rating of 24,000 btu AC only. I would normally run the otr AC to bring down the temperature and then use the basement unit to maintain the coolness. This bus will be weekends only for the next 5-10 years.

Grant I have nooooo experience with conversions but I'd think if you are keeping OTR 24,000 will be plenty as if really needed to bringit down to a reasonable temp where the basment air could maintain it you could temperarily fire up the OTR ! Hopefully some of our A/C gurus like Nick, Christy and others will chime in with their expert opinions BK